Online Stopwatch
A stopwatch measures the time that elapses between starting and stopping it, down to the millisecond. Our super-simple free online stopwatch is easy to use and millisecond-accurate — just press start to time any activity.
Online Stopwatch
How to use the online stopwatch?
If you want to start the online stopwatch click on the ▶ (Start) button and the stopwatch immediately starts. If you want to pause or stop the watch click on the ▌▌ (Pause) button. If you want to start again the stopwatch without resetting the timer, click on the▶ (Start) button again. If you want to start a new timer, then click on the RESET button then ▶ again. It’s so simple. The online stopwatch shows the current timer also in the browser’s title.
How accurate is the stopwatch?
Online stopwatch is milliseconds accurate. A millisecond is a thousandth of a second and 1000 milliseconds is one second. This means that if you are fast enough you can measure a housefly’s wing flap which takes only 3 milliseconds. In fact, this can not be measured because of the average human reaction time is 284 milliseconds.
Frequently asked questions
How do I use the online stopwatch?
Press start to begin timing, stop to pause, and reset to clear it. The time is shown live and accurate to the millisecond.
Is the online stopwatch accurate?
Yes. It is accurate to the millisecond, which is more than precise enough for sport, study, cooking or any everyday timing.
Does it have a lap function?
Yes. You can record lap or split times while the stopwatch keeps running, which is useful for intervals and training.
Does the stopwatch keep running if I switch tabs?
Yes. It keeps timing in the background, so the elapsed time stays correct even if you switch tabs or apps.
What is the difference between a stopwatch and a timer?
A stopwatch counts up from zero to measure elapsed time, while a timer counts down from a set time to zero.